Coincidence and Absorption Investigation of the Disintegration of ${\mathrm{Rh}}^{106}$, ${\mathrm{Sb}}^{125}$, and ${\mathrm{Pr}}^{142}$

The disintegration of ${\mathrm{Rh}}^{106}$, ${\mathrm{Sb}}^{125}$, and ${\mathrm{Pr}}^{142}$ has been studied with the help of conventional absorption and coincidence counting techniques. All three isotopes exhibit complex beta-ray spectra, on the basis of the shapes of their beta-gamma-coincidence plots. A definite gamma-gamma-coincidence rate indicates cascaded gamma-rays in all the disintegration schemes. Corrections for coincidences between gamma-rays and x-rays resulting from internal conversion are discussed for the case of ${\mathrm{Sb}}^{125}$.